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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Help with a super rich condition.
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[QUOTE="adstott, post: 677971, member: 31528"] I purchased a 91 CR 125 last spring that was in terrible condition. I tore the bike completely down to the frame and rebuilt it. I replaced the exhaust with an fmf fatty and fmf spark arrestor muffler. I rebuilt the top end and had the cylindar resleaved. I cleaned out the carberator and restored it to stock settings. I mixed my gas a 40:1 and was burning up spark plugs every two hours. I leaned out the clip and that helped out some but I was still burning up plugs. So I went down two sizes on the main and one on the pilot (which happened to be the suggestion from FMF) and that was a little too lean on the top so I move the clip one position richer and it was running great, like a new bike. That was two weekends ago, this last weekend I went riding it started fine and ran great for about an hour then I stopped and talked to some guys at the track and when I was done I couldn't get it to start. (even when it's cold it would start on two kicks) I was able to bump start it but it ran terrible. I went back to my car and took out the plug and it was by far the worst fouling I had ever seen. There was also more black gunk out of the muffler then ever before. Worse yet there was black stuff seaping out of the head gasket. (seaping out in only one spot about two inches across) So here's my question is the head gasket alone enough to make it that rich or is there something else. I looked at the carberator and both of the jets were still there. Any help would be appreciated, I hate taking my bike to the local shop unless its to get a tire changed. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Help with a super rich condition.
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